723936388 has 36 divisors (see below), whose sum is σ = 1481287500. Its totient is φ = 308667072.

The previous prime is 723936383. The next prime is 723936403. The reversal of 723936388 is 883639327.

It can be written as a sum of positive squares in 2 ways, for example, as 618914884 + 105021504 = 24878^2 + 10248^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (723936383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29238 + ... + 47986.

It is an arithmetic number, because the mean of its divisors is an integer number (41146875).

Almost surely, 2^723936388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 723936388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (740643750).

723936388 is an abundant number, since it is smaller than the sum of its proper divisors (757351112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

723936388 is a wasteful number, since it uses less digits than its factorization.

723936388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18964 (or 18955 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 49.

The square root of 723936388 is about 26906.0660075010. The cubic root of 723936388 is about 897.9113656995.

The spelling of 723936388 in words is "seven hundred twenty-three million, nine hundred thirty-six thousand, three hundred eighty-eight".